13

LTC1545

Figure 22. Controller-Selectable Multiprotocol DTE Port with DB-25 Connector

10

17

18

D2

D1

LTC1545

RTS

DTR

DSR

DCD

CTS

D3

R2

R1

R3

D2

LTC1543

LL

RI

TM

TXD

SCTE

TXC

RXC

RXD

M0

M1

M2

DCE/DTE

5V

GND

2

21

14

24

11

15

12

17

9

3

1

4

19

20

8

23

10

6

22

5

13

18

25

*

*OPTIONAL

21

7

16

1544 F22

D3

R2

R1

R3

D1

C2

1

µF

C1

1

µF

C5

1

µF

C3

1

µF

C4

3.3

µF

TXD A (103)

TXD B

SCTE A (113)

SCTE B

RXC A (115)

RXC B

RXD A (104)

RXD B

RTS A (105)

RTS B

DTR A (108)

DTR B

CTS A (106)

CTS B

SG

SHIELD

DB-25 MALE

CONNECTOR

TXC A (114)

TXC B

DCD A (109)

DCD B

DSR A (107)

DSR B

D4

16

10

9

7

6

4

3

8

11

12

13

5

2

15 18 17 19 20 22

LTC1344A

LATCH

C6

100pF

C7

100pF

C8

100pF

5V

23 24

14

1

CHARGE

PUMP

28

3

1

2

4

5

6

7

8

9

10

11

12

13

14

1,19

2,20

3

4

5

6

7

8

9

R4EN

D4ENB

15

16

24

23

22

25

26

27

28

29

30

31

32

33

NC

27

26

25

24

23

22

21

20

19

18

17

16

15

34

35

36

M0

M1

M2

DCE/DTE

M0

M1

M2

11

12

13

14

C12

1

µF

C13

1

µF

C11

1

µF

C10

1

µF

C9

1

µF

RL

D5

21

R4

R5

LL (141)

RI (125)

TM (142)

RL (140)